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10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations. The mean of the combined set is …

Q1

10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations. The mean of the combined set is given by

a

15

b

10

c

8.5

d

7.5

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